Subheading 5402.44 · Section XI
Yarn, synthetic; filament, monofilament (less than 67 decitex), other than high tenacity or textured yarn, elastomeric, single, untwisted or twisted 50 turns or less per metre, not for retail sale, not sewing thread
Source: Harmonized System 2022 edition (World Customs Organization), from the UN Comtrade classification list.